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THE POPULAR SCIENCE MONTHLY 



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Fig. 7. Group Activity of Sooty Terns. 



spicuous animals possessed poisonous or disagreeable qualities which 

 rendered them unpalatable, so that their enemies soon learned to recog- 

 nize them as uneatable, and thus the more conspicuous their appear- 

 ance, the more surely were they protected. 



It has been assumed that the beautifully colored fish which swim 

 so unconcernedly and slowly in and out among the caverns of the coial 

 reefs were good examples of warning coloration, for over the sandy 



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Fig. 8. Groups of Nesting Sooty Terns. 



